Documentation for OpenJump can be found at http://www.openjump.org . In the fullnes of time, I know you will study those docs, but for now you can try to just follow the directions below. Remember this is all just a digression.

1. at the unix prompt type: openjump
2. Select Layer -> Run Data Store Query
3. click on the
4. click on the Add icon
5. Fill out the form:
   • name is arbitrary demog215 is a good choice
   • server : coale
   • port : 5432
   • Instance : demog215
   • User : your username
   • Password: duuuuh
6. If that worked you, you will see a happy green dot indicating that "demog215" (Postgis:oale:5432..) is connected. Hit the "OK" button at the bottom of the dialog box. That should get you back to the "Run Datastore Qurey" page:
   In the Query box type:
   select ST_AsBinary(geom) from fastfoods;
   then hit "OK" and behold the wonder of it all.